Police have arrested a parolee suspected in two Palo Alto bank robberies, and investigators are now trying to determine if he’s responsible for a string of heists in San Mateo County.

Mychael Tillman, 43, whose last known address was in East Palo Alto, was arrested near 16th and Valencia streets in San Francisco, said Inspector Dan Gardner with the SFPD’s robbery detail.

Two officers from the San Francisco Police Department’s Mission District station made the arrest, acting on a warrant from the Palo Alto Police Department.

Tillman was jailed on suspicion of two counts of robbery and making terrorist threats in a connection with the Palo Alto robberies, which took place on Feb. 19 at a Bank of America and the following week at a Bank of the West.

The suspect in both of the robberies wore a fisherman’s hat and passed a note to the teller, said Palo Alto police agent Dan Ryan.

Steve Wagstaffe, chief deputy district attorney for San Mateo County, said no charges had been filed against Tillman in the county as of Friday. Even if he is charged here, he would have to be tried in Santa Clara County first, he said.

Wagstaffe said Tillman is being looked at for robberies in three local cities, but declined to elaborate, explaining that police were still investigating.

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